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Stock-Based Compensation Plans (Details 7) - Restricted Stock [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Nonvested/unearned shares, other information |  |  |
Granted, Weighted-average grant-date fair value per share | $ 41.70 | $ 38.53 | $ 31.76
Total grant-date fair value of restricted stock vested | $ 3.5 | $ 3.3 | $ 2.1

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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